Improvement in flasks for moulding



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THOMAS e.' Lucas, or MVIDDL'ETOWN, coNNEoTicUT.

Letters Patent No. 96,819, dated November 16, 1869.

IMPROVEMENT IN FLASKS FOR MOULDNG.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern: y A Be it kno'wn that I, THOMAS G. LUCAS, ofMiddletown, in the county of Middlesex, and State of Connecticut,haveinvenfted a new and useful Im prove-ment in Foumlry-Moulding; and Ido hereby declare that the following is a full, clear, a'nd exactdescription thereof, which will enable Others skilled in the art -tomake and use the same, reference being had to the accompanying drawings,forming part ot' this specification.

`'.lhis invention relates to a new and useful improvement in the mannerof moulding patterns for making castings yof iron, or other metal,andconsists in the use of a draught-plate, (one or more,) in combinationwith the pattern, as: hereinafter more fully described.

In the-accompanying drawing- Figure 1 represents a central longitudinalvertical section of the tiask, the pattern on its match-plate and twodraught-plates arranged as they are placed in the mould or flask.

Figure 2 is a view of the draught-plate.

Figure 3 is a vertical cross-section of tig. 1, through the line :t fe.

Similar letters of reference indicate corresponding parts.

The object of this invention is to prevent the breaking of the sand atthe corners or angles of the mould -in taking cti' the cope of theflask, (from the pattern,)

and in drawing the pattern from the mould.

ThisI accomplish by means of one or more draughtplates, made of metal,or any other suitable material, which plates'are made to accurately titthe pattern.

In this example of my invention, I apply the improvement-to the mouldingof a pump-cylinder, the pattern of which is marked A, in the drawing;but the `improvement is applicable to other descriptions of cast--ings-in fact it is applicable to almost every description of iron,brass, or other metal castings, as the draught-plates maybe made toconform to the shape of almost any pattern, whether presenting a plainlevel surface at the parting of the pattern or not.

B represents the lower part or nowel of the ask.

C is the cope.

The pattern A is attached to a match or card-plate, d, one-half of thepattern being on each side. The use -of the match-plate is common inmoulding.'

`.When the pattern has been ramined`,or properly embedded in the sand,the cope is lifted olf, leaving the pattern and -niatch-platc in theirformer position.

The match-plate and pattern are then raised from the lower portion ofthe tlask, the cope is replaced, or the i'lask is closed, and the mouldis complete; this, of course, after the core7 has been placed, and thegating ii'om the sp1-ne finished.

. So far as we have described, we have not brought our improvement intouse, but in taking the cope off the pattern, and in taking or drawingthepattern from the noweh7 or lower portion of the flask, a diiiiculty hasbeen experienced which our improvement is designed to remedy, and whichit does remedy completely. lhe ditiiculty is, the breaking of the sand`at the anglesaml corners, when such anglesand corners are raised fromthe pattern, in lifting the cope, and also when the pattern is raisedfrom such angles in being drawn from the noweL There is a certain amountof adhesion oi the sand to the pattern which the most skilful mouldercannot wholly prevent, which adhesion, or the unsteady handling of thecope and pattern, or both combined, oecasions these breaks.

The time occupied by'thc workman in mendin g (with trowel and fslick orwith his finger) these breaks, is frequently equal to all the rest ofthe labor performed in making the mould. The extent of the difficulty isin proportion to the skill of the workman. and is a. very serions onewith the most skilful.

As a means of lessenng the evil, the moulder is compelled to use hissand in a very damp state, which in almost every description of mouldinginjuriously-aftects the casting. By the use of the draught-plates, thesand may be used comparatively dry, while its breaking at the corners isrendered simply impossible.

To accomplish this, we use` one or more draughtplates E, which are (inoutline) ofthe forni and size of the flask, but with ends projecting, asseen in fig. 1, so that they, or either of them, may be lifted eitherwith the cope or with the patterns.

The match-plate ll project-s in the same manner, and for the purpose ofdrawing the pattern. I

The plate E is made to perfectly fit the pattern, as the space oropening F, fig.-2, will tit the centre of the pattern A.

The pattern is made in two halves, separated by the match-plate, as seenin the drawing. Now, to the flat side of each half is added just thethickness of the draught-plate E.

As seen in fig. 1, the parts of the flask are separated by the thicknessof all three of the plates, but the flat side of each half of thepattern corresponds in position with the closing surfaces of the fiask,so that when the plates are removed, the parts ofthe tlask will closetogether with just half the mould of the cylinder in each- \Vith theplates on each part of the pattern, as seen in the drawing, (figs. 1 and3,) and thc parts of the ilask filled with moulding-sand, rammed aroundthel pattern, the moulder, in taking oft" his cope, will at the sametime raise the upper draught-plate E. This plate as before stated,accurately tits theupper half of the pattern, and as it is raised, itnecessarily lifts the sand clean from it, leaving nothing to be done inthe way of mending.

The next operation is to draw the pattern with the match-plate d. Thelower draught-plate (accurately ltitting the pattern) rests upon thesand in the nowel,

\ V\and remains there while the match-plate and pattern thesedraught-plates in certain cases, nor is it required to use either inconnection with a match or card-plate exclusively.' I do not, therefore,confine myself to any particular method of using the draught-plate, norforl any particular description of casting, but design it for moulds forcastings of every description to which it may be made applicable.

Forthe purpose of furnishing a further illustration of the use of thedraught-plate when employed singly, and to show its adaptation topatterns which do not part in the middle, we will introduce the drawing,sheet 2, where the single draught-plate is seen without a match-plate,and' with the pattern in a single piece.

Figure 1 is a longitudinal vertical sect-ion;

Figure 2 is a vert-ical cross-section; and

Figure 3 is a view of the draught-plate attached.

Similar letters of reference indicate corresponding,r parts in bothsheets of drawing.

lIn dispensing with the match-plate, for supporting the pattern, asheretofore described, the pattern may be extended at the ends, so thatit will rest on the ends ot the flask, there being` recesses or slots inthe ask to receive such projections.

These projections may extend through the flask, and serve as handles fordrawing.; the pattern, but in mouldingthe pattermeither in one or twoparts, withoutl the match-plate, this arrangement is not indispensable.

It will be seen that the thickness of the draughtplate E is added to thecentre ofthe pattern, as de scribed above.

In taking off the cope, the plate is lifted with it, raising the sandclean from the pattern. When this is done, the plate is replaced overthe pattern, and then the pat-tern is drawn through the plate, while theplate keeps the sand to its place, as before described. The

plate is then lifted from the sand, and the cope is replaced, and themould is complete, as stated above.

By replacing the draught-plate overthe pattern, after the cope has beenremoved, all the advantages of two draught-plates are gained, with but aslight addition to the labor,l while the expense is somewhatdiniinished.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patent- The mould,composed of the parts B C, and plates E d, constructed and arranged asdescribed.

i' T HOS. G. LUCAS.

W'itnesses J oHN L S. Ronnn'rs, f GHAs. G. R. VINAL.

